Malicious PDF — malware analysis report

Static analysis result for SHA-256 96662efa50544ff0…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 08:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8178929e24fad15c1d05b8c0ef57260e SHA-1: cada7b58a22f9acf2934fb028bfe26072374cf4e SHA-256: 96662efa50544ff06728012c4be65f433086d807f0ecf06a97645f1fc3418c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. It contains numerous external URIs and links to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content do not provide specific instructions but rather serve as a lure to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=live+wallpaper+not+working+iphone+11
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071909ede104---lidajuditejap.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9653795c98---99423536048.pdf
    • http://geologocarmignani.com/userfiles/files/wixaturuwarugaso.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qjvp0suv06nfa1vvvmdgb03fml/pedunetegowosogubivu.pdf
    • http://constantemail.com/userfiles/file/162472214721539232666.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092699b7e61d---94648772619.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e9402fb7d---8153726927.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/8hd39u2acnobq72tc6jb3ubj3a/lavazujupugatiwaduzufuzef.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa280b84089---romapupirenifelagojarazug.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb81d8bc47---94882203015.pdf
    • http://soflocops.com/clients/67403/File/riludewogibuvupofekerali.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c56e3336a44---sigenezuj.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/elpv084imalvqi1kpu7vc59n6b/43907041581.pdf
    • http://telmeed.com/web/ckfinder/userfiles/files/97272813728.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/dqgn0miutksm772agvadbrpncm/89757153040.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/65097d5d07fbb547629c376e2916f0ae/fewuzetizapafi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf1591715---23217320138.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7c095e0e---mononewivapojevogafasataw.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/savibofogadup.pdf
    • http://bukharageorgia.com/sites/default/files/file/6181284761.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bct1nsnd809d1nguilr5kqngu6/83629056137.pdf
    • http://plnjl.com/userfiles/files/buziluxosudomumovamilegaj.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160960342b83bc---dolezuf.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/68048053250.pdf
    • https://m-astar.com/UserFiles/files/sapil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ef.bin
21fd30e9d742fa715952509d3598256b70404f4a3841d6145d3be3937fde8a5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 19648 bytes
font_01_sfnt_off00012529.bin
57958c44955f63f1f42f2c2d0b4d307982e2febeddcd062fd9ab30782f5c077e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 10616 bytes
font_02_sfnt_off00013d74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D74 16792 bytes

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